Species analysis
Statistical exploration
Classification trees
Variables
Northern Harrier
Occurred the most disproportionately in hexagons with 218-431 mm
annual precipitation, no ponderosa pine forest, and more than 55% of
their area as public land. Almost equally likely to occur in hexagons
with more than 4% ponderosa pine forest, and in moister hexagons
(431-683 mm annual precipitation) that have more than 1%
agricultural lands. Among hexagons that are even wetter (683-1511
mm annual precipitation), the species is most likely to occur where the
extent of public land is less than 22% or where there is greater public
land acreage and more than 1% of the hexagon contains freshwater
habitat. In the wettest part of its Oregon range (more than 1511 mm
annual precipitation), it occurred in hexagons with any coastal dunes
and ponds. The logistic regression analysis showed positive or negative
association with sagebrush steppe, number of land cover types, the
extent of public land, April maximum temperature (hex. min.), April
precipitation (hex. med.), and-to a lesser degree-total freshwater
habitat and July precipitation (hex. avg.).
Classification trees
Hexagons: using ONHP land cover classification (accuracy score: 85.81)
Squares: using ONHP land cover classification (accuracy score: 78.91)
Hexagons: using AVHRR land cover classification (accuracy score: 85.35)
